Messages in this thread | | | Date | Sat, 26 May 2007 19:03:12 +0400 | From | Manu Abraham <> | Subject | Re: PCIE |
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Roland Dreier wrote: > > I am now wondering whether the usage of MSI would help in this case and > > that i should be using enable_msi before request_irq ? > > MSI interrupts are never shared. So if pci_enable_msi() succeeds, you > can be sure that the interrupts you get with that IRQ number are > coming from your device. >
i presume then i shouldn't be using IRQF_SHARED, if using MSI.
Another question would be if the device supports multiple messages, MSIX should be used ? In such a context, if i request for say more than the messages that i need, say i request 16 messages, but use only 1 or 2, that does bear any consequences ?
> But using MSI does not work on all systems, so your driver needs to > work with standard (possibly shared) INTx interrupts too. And you > should probably provide at least a module flag to disable the use of > MSI, to avoid problems on buggy systems.
I should probably look for CONFIG_PCI_MSI and check whether the system supports MSI pci_enable_msi() ?
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